ⓐ Battery could completely be discharged.
ⓑ Battery cell wrong inserted?
ⓒ Contact problem between Battery and Radio?
② Fail to transmit
ⓐ Run out of battery or charge problem.
ⓑ Fault of PTT key
ⓒ Fault of Q4, Q5.
③Transmitter works but frequency is unmatched
ⓐ defective frequency synthesizer.
ⓑ defective X-tal (X2).
④ No audio modulation (Tx power and Tx frequency are normal)
ⓐ Problem of microphone or mic connector.
ⓑ IC U7 problem.
⑤ Tx is set when switch is on.
ⓐ Tx switch problem
2) RECEIVER
① Rx does not work
ⓐ Speaker line open problem or connector problem.
ⓑ Receiver power circuit problem.
ⓒ Audio amplifier Base band IC U4 problem.
② Only noise sound
ⓐ U12 problem.
ⓑ VCO problem.
③ Rx sensitivity is weak
ⓐ Antenna mounting problem.
ⓑ Front-End circuit problem.
ⓒ Local oscillation frequency deviation.
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